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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fc17a8dcf3ad7f6491f1e7bdb65724ef8ff29cdb6aa0defb50b917a42b1322' 
  AND token = 'csUdAlGbknu/NJgnp+CxfYM5mAo3/Kyefpl02I/MAFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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