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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fc139c051857c5d8c98dde8129d8110c91fdf66425daf7b711bf7c0b7f8abf' 
  AND token = 'RVIHSfjGt8Xlucfv1q+17e8vLxzMpjYvGy4rlOahE4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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