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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dee26ef534c482a3a05496042636be436096616209fdbfba9f536f4d6dab472' 
  AND token = 'ZXbDZJExU2hJhait2m4tXoMv0ywA6Y9lVrr8uehWHEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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