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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46962fa1ab17c79debfc01caa11429af16415bfe33309c09e4a6015cd9db6b82' 
  AND token = '26yqe3XG3SFdBIDw1EFbIR6Jz0WNn9ZwtW2k1ZUvklM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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