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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e633d7336f264122639b6aa6718096e903907dc173c2ea56fe2ae308da511f0c' 
  AND token = 'kg+szFrqZ29G0ZpvxYACp21VgLcp/HTjGdH/1jA5+sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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