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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1e5b07fac287273d5c65ee42d6fcef1a23456bbaf15cbad902b7cb31fdb1f2' 
  AND token = 'ZpxXdfg84L9JaZMzdIcD/qgz7h5dEruPacSsKNQZkAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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