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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e79aa6ad3c335baf23d057951efcfa10391f89c7784c6bd30e46ca85b6e9cbc' 
  AND token = 'OnQJrFD0DgnvfQI2t0FvZtX91f9BfFRhWcpqUqKNAIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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