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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2348e4fd4a5637a47ec2ee370f8bbe67cbb7e07dcde1c36fa907f1d35b7dc50' 
  AND token = '1qAoiJ0XqLtB2XKnyup+6fELJuRJQvzeOwvdvEjqMbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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