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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0192f4f0a206f9f76334ca2bc37d992a093831c42809de1f4b48b5bcaf719147' 
  AND token = 'iDfxqqDkhtuG7VfKUj4sxcISR9Djv4entzzCqtBvrLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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