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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edf8ce6c97e62528a2fae7f291d24edad0d1c849f44f127a4f78032ed7a6bbf' 
  AND token = '3oSWQumjUN9JFT7iZCz/J/a+sEReVoHKIlircKNqsGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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