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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3536ca1e9824b4714637f9b53be61ab6af1b0f319f579b142a7d4002c7ea4b1' 
  AND token = 'AKSwAdvwVytVie8HFBMgasSLfwzSZVFWahU8RWr0Q98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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