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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20938700407ea8d49880b2c6560543b4f7f605a6f1de3a916b3884d64d2e16b3' 
  AND token = 'iu5nfmy0KGCG3wAPWfurzd3CQWI5Q0GoUM1Oq8teKHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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