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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c293b898ada44716c5a994b8f99f366940ed1d9308a49457d9135c807e3535aa' 
  AND token = '1WMnt4RAWgNBmcDWfPOQ7+ZGmXV0a/HlFdroUH3jxCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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