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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f2c621b66762e201b6506e58ecd2538ae16724e023cedc44167e5e37367d4b' 
  AND token = 'zVaiIl3chX6MbjAue3kcOY+WCXg3vQO/K6Is06+cjyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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