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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0358f9b7e071a0ff703fea3d1c71f6995668bd65665a66c89a917e254a883c07' 
  AND token = '74eLIpNCvidwumfHypEb7OcrlgWC34eoohF0kH2Jh4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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