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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f88e20aa0e6e445b36a7953ca06ce7636616d1bf0efb9f8df68fd9d5e35892' 
  AND token = 'Llv8k8bNSeeA6snLy/p0dX8VoHtTXK7xUCL9dpTSSq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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