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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfb22737af247e70a02e5a92257b5886f41994677c2e5f681b815c33b0a612f' 
  AND token = 'Y1+eWS8HnD37J5BrRuLHBNAnvxQ37CKehD291d0yVSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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