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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897600a1a1dc82b27cc1e0db7f5b50cbbcf9ee818def1ce939976f69fd3eee56' 
  AND token = 'YzgUR+9VLwpxL1bmShqziLYgGcii/hcXgjLD9uqIwc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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