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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5487c0377578ae0185606addc33fd976fdce2fa2388ce21630294f16cf7b8a93' 
  AND token = 'KJlVoQUorrCFkCuNdclwN2tn1j5RozaZGgKmcyIPfcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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