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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb996a1fa104ee0066478ee08a2032f3fffe8f7788a83ceb3acef3c971fc37a' 
  AND token = 'CTQfgf7KkCCZMx4eW7ckKIWkP+NNdR1pOdG0jjDqHY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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