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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd586e67461ddfc6c4bf83646c97da1fda84f6bfade1f708025f06d5be85b6b29' 
  AND token = 'y/2zCmznQJwR1fopObc/ZIiYyomJowLm9GLeg7qpRxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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