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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430cb84149effa04084f11406d5ed377cecd5ce56c5683b2de3b36c3d7b6a2ae' 
  AND token = 'TO+eLm6QwYWcXZ0esrbunGsejf7Zev+sosrgepzIMEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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