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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24785dc43055bfc70d6aea63f81fd5408c553052de95f9a7b59111b3a2caf40c' 
  AND token = 'erKsYhMsQBdHDZseRlhilJOGPaRp/ef6uDnzMGSBMZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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