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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6eb6ab32440240146ffcf1e108e0519d3e17743452170c5351ac1df96fadb5d' 
  AND token = 'P3rkQbc+NY2GH5fDmj3SC+8MRQjS5g0nIrwdQuXwYgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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