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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3eab0e23287f733fd02c2f7799e99797df7fd8afbcd7cdb075bf97cc421261' 
  AND token = '2SYkfgoZRxCfs6OPVGnS/L735M1afqF8HIiSH4Iwt8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}