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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace07a5533f5d01ebc5a1ddd4c032166b6199155a04807f0787425687e968572' 
  AND token = 'MSLDTe7pciyz5jGfUdgelZ7S/5k+mS9cIWq2aV5QRSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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