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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624ed2b61b87aa0ff0e5b58cbc09fee0ed9dca6b90c9083bc8451191cddd960f' 
  AND token = '6xnjvfA0eQ2UaXFIG3XCTEaehtsWOfGNmeyYpzE9KVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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