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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32b79bea0eb95e03f83091468bfc1f3cbce77fd794ff9e8aae4f30cf5f96e53' 
  AND token = 'EgoqbyegqgUd3i620T1JYbUMomW/fx4QiXe48ni9mFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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