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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7712099e4ac538fc21a3f6776d9e9a929d442061f2b57dff32c99edc6279d4bb' 
  AND token = 'I5hu0fES4wFdsGM3YYMZrbifnZcfJJWu1/bnKSKaFUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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