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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ad5f3ac8155b2244d11d4df673cc6fbac70ad1c37f027edfba4b5d16eec4dd' 
  AND token = 'mM4HAM1R7TSA7t4I5kMTkrq3DHVMk7uZpzNFfSJuX8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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