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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afb0187b2fb81a2264e2ceb14f8cac4957ae7b80c8a91ad9f37be2b64748ccf' 
  AND token = '+A7RHyAidfLkOt6PSvzAx2pL8EPXQBjI2EwJjoQ0ZW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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