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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70d69c0bb286bfc4d830cf93406cd762a6ff7f7547f9d2759085dc591f5a25a' 
  AND token = 'CmTblaCgWngg6RNQQJwByEjJXgYPpkser7HAha9zDHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00399

JSON explain

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