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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57083b55f7aea7d4e17aae2360d6e963561186ca3062924ec200000a2324c70e' 
  AND token = 'yEQDhxIrWBSgs1iMwNQA66hoD8WJ2pD3pUVuwfFdPb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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