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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3cfe5e3f981af805a9c265b2b0c6e65b2ba492bf5dffaa6a83eef425173b4c4' 
  AND token = 'nceE7+7kAb2Hszga3Qn9F5jYFZFesdlHBkcm8Whvi2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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