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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3752b17e485129604d0c523016d1ea60e336055b00059d1d89f38096b6e3bbd7' 
  AND token = 'zv4+CF3hBYA95CegVdJSCvtTrJ/gxIM1f1wTdejqWE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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