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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca872f9f733ee6e37be2b1ae52017d798a17464e2195b5948168c5208a0b903c' 
  AND token = 'Ppkycq227EGpCSHpYTAeDchHuFnWOuI/HL1l6l1fmPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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