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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68ba335c03df6764bde54a9b583d2e412f395a91f152d2a24bacf57567b9944' 
  AND token = 'MeRypWh+WAFsReAp326DNFayL/Tzl0FWy02xd6CL4FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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