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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bac7cbaeb53fa0a340689b06c0771d18b685060e598f99d10e1e4bdc13a1699' 
  AND token = 'QdHjctCqAhUI7ZIY+4EXLgTnC9PKk6hKWw4CGMGnJzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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