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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b9c3642afe896c61a0edcd2b3013a074c79806d94701764fc1b9e0b1025a0d' 
  AND token = 'H/TjMJgFd1nxf+HDlGbwpAiVAXaYNeqnN2jVkyblPRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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