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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd35c0b1b4cedbf2807b48e718334fa5980f37b6bdf2d1186817cd4410774776' 
  AND token = '1WzNBvbAKgcyxXFAm5FbBLg9jbIAfR3inoinCpxG72M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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