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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7575ca15fca16cd5e4e15261e840f84fb4991efe298ddd1d558543be986851' 
  AND token = 'p1zGE1g5//Lp/KhA36d9EX+qp/LEj4E0+5Zq+oNOuhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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