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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc0da89241a9058a8b5252dc968589dcd1cb27eee55388d128a9fe534a7b9a7' 
  AND token = 'en8kyeksyYX5OKH7u1PYJm8AR/TwuhXJh36j/epfJhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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