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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2668b32570cddf0af95a2425c89ffda151ec73827cda8506211da07a622fbba6' 
  AND token = 'PBp/NB2mtN2ZUKVO3HNi1ZwuxEFilkySAJysw2aQFb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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