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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cfa1c9018754226d6457a722d369921575d7ab05e06a0d235976e0820e1900' 
  AND token = 'PeLd5wGPvzckhm9PtMLVeD8FhKLNFJq8UQJke9w2MGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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