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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a566ef6e2636317f7e5e780cb1548380d17c7bc87b79dbb34c02f99c78d0f02' 
  AND token = '0iCfXpqwqPN2z0Dm/UB1Rbd/0nQhljXhcCXeYOjDXzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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