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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84dee783d4962d8118a45b49197702e35bb4d62ac6d0202c2a5e5cf71378ad2' 
  AND token = '5QP0ADexhfEQF4PL3lHQhGs2ouPnmdH5t/kJy71sif4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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