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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbf82086d69c259bcfee44035fe65160f652bc4d37b14ef4e940ea96ddc82ca' 
  AND token = '7jZLBTtx/Y4100esOTBqo1Zh/nFihsn8IhKTGxy0PxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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