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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11e266be86a901d7faaafd30582e7e7df3bf6ceb6f0234f1e9b78fb4691d63e' 
  AND token = 'HSVEIowXhqDvfPM3ENMaq/TeyvfPe3S3hNQOYQumJN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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