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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ef10e35b3576d4e5e5a876181f9c6c3a57a96a8786f43bc6ad6aa579a52365' 
  AND token = 'NYNFWiMXm5X0an4fVaoBh/iuiOKCpZVDenhk4FzWlbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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