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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe1111dc7e52b660e6e6c4945c3470b90c9f09d330ee24730baf1fcbb68733e' 
  AND token = 'Zke73oIGZQijqrbm8pYl6dlfewrS7NDkDvWk8u9AHYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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