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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10eec478a668557c4361673c81f1636e347954077ceb1ea7633d4a4cdf6a96a' 
  AND token = 'DDW2VXpbpAoItRMLhL3+ximvcH2/LhFqdVhqiC9Pnx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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