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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1aa668485c13466fe3353f344eef439c1e8298a0be33cf08455e724a039b2f' 
  AND token = '0WAI5KLaSYvG/hRzuSx/K0ebDodEZFljlvCPqnkRcbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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