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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6fef3ed935f33ef94e95f4935bc68bf9adc71ec1a56720b2e71e5b0e1fe0a7' 
  AND token = 'tNRqQLL0FgNKSoB+qGY2ZY9sEalxMENj0t+UZSTKXBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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