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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c83f0410f96f0cfeb190cb3d1060f2c44327bc2b306ac7e9f1e125853294c6' 
  AND token = 'qEcpaTuYLc1VzK7n1m6oC6XJKYQtC8hdcvhbp1xcbYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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