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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ba34f3bcf002f55b1b10618e6ac67714a04afc4c2a7939a90294146685b8d4' 
  AND token = 'sFrQderwbgywxKfWAbeX/hQecOAgkRjKH/nX218Z7HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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