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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2954dc79ffcbbf88eaeb660f4ceb566c8abf8973363aefb96960d97c3544afce' 
  AND token = 'LYiizOM492UMtghwHACO7ONpfwLOmvGQ4tL5I1VpKuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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