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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd987fc0e143aa4130b512c905fef78f312570d271b0f35ceedfa71d89a53f8' 
  AND token = 'ssBXCfFWrMwZPDz8wBwNs7SUXaY0eUrEH8E8/Q0R64s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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