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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9aa00775883a712ec5e3935ef471b994a225ead87ca5c2fc870b2e3401e262a' 
  AND token = '7GnJmYuKJ2lnJ0VDXvm3Vp9gGTbyh3xWi48WSatdbWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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