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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b508b4f5d330971fa59dbebf22322a79aa354767630b44cf95baa0e99ccff' 
  AND token = 'MWn0GLzV2pwnUUk3a+op6CLjS8lmhQ4i3fhRh8soNQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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