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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4787c71152875040e96931701766711cdb3e5a95420f92d5ae05b5045ee5c74' 
  AND token = '319O6WiDqV2lYJU8/cVUorAK8I2G3YABvs+GW8kh3S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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