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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d84a6467e4363ad0c852ce20cad570c1760e2c8cea2b2f7203191bf9d7046b' 
  AND token = 'an3q1lbQnsN5aT5B/slJ2fU3Faj8+WyfRD5wG9hlLN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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