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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec51833ce0c7e097914ba8cdaacaa7d9d972d6185c95c2ab26e247a49aec9fc' 
  AND token = 'c7PiUtBKSRtbD3JOQlD72d/NJjbxRpfWBcMzYQq/0PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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