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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7a6c15493a3ff82b41add879fbc755bb7a5d982b3b2505a22646a1bd65dc45' 
  AND token = 'IDU1trHrlk63kqcRWHB3bcAtcaJLC3vAtqS4MzIST6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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