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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2361997334d1a5b8c1888243e578c28319f68c69a4453f7459dd206d78f9a9a' 
  AND token = 'teb9Anz4r/e39KI7m8q1ENcljXPrtk8wcftGnDNt/XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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